To see Rebecca Meyer, Tara Costa and Ali Vincent at a recent OK! photo shoot, it’s hard to believe that they once wouldn’t wear swimsuits. But thanks to NBC’s The Biggest Loser (and hard work), the’ve lost a total of 394 pounds.

The best thing The Biggest Loser has taught Tara is that, “It takes 21 days to break a habit and 42 days to make a new one. For 21 days, I was basically in detox, and for 42 days, I was forming new habits that became second nature.”

Such as?

“If I want ice cream, I’ll get a cup of frozen yogurt — I don’t buy a gallon. And I stopped eating carbs after 4 p.m., so no pasta for dinner.”